23040000021 has 16 divisors (see below), whose sum is σ = 31251308544. Its totient is φ = 15096607344.

The previous prime is 23039999933. The next prime is 23040000029. The reversal of 23040000021 is 12000004032.

It is not a de Polignac number, because 23040000021 - 2⁹ = 23039999509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 23039999961 and 23040000006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23040000029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 241815 + ... + 323348.

It is an arithmetic number, because the mean of its divisors is an integer number (1953206784).

Almost surely, 2^23040000021 is an apocalyptic number.

It is an amenable number.

23040000021 is a deficient number, since it is larger than the sum of its proper divisors (8211308523).

23040000021 is a wasteful number, since it uses less digits than its factorization.

23040000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 565400.

The product of its (nonzero) digits is 48, while the sum is 12.

Adding to 23040000021 its reverse (12000004032), we get a palindrome (35040004053).

The spelling of 23040000021 in words is "twenty-three billion, forty million, twenty-one", and thus it is an aban number and an uban number.